First, you cannot use an iPod, out of the box, to copy your music collection to multiple computers you may own. Millions of iPod owners have more than one computer, and it’s perfectly legal to copy the music you own to more than one computer. But the iPod won’t help you do this.

Second, in families with multiple iPods sharing a single computer, the iPod’s companion software, iTunes, doesn’t allow you to have multiple music libraries. With multiple libraries, each user could see only his or her own music, and could synchronize his or her iPod with that personal music library.

Apple is aware of these shortcomings, and I wouldn’t be surprised to see it solve the second one, multiple libraries, this year. But the first, the inability to use the iPod to copy music to multiple computers, is tougher. Apple was forced to cripple the iPod in this manner at the insistence of the record labels, which feared that it might be used to copy music too widely. So a fix probably requires negotiations with the labels, whose obsession with piracy has caused them to treat their own customers like criminals.

Luckily, there are solutions to both problems available today, through third-party software or workarounds. Here’s a guide to those solutions.

First, here’s how to use an iPod to copy music to multiple computers. You just have to download and install one of a number of small utility programs designed specifically to let you copy the music on the iPod to a computer. There are lots of these, for both Windows and Macintosh computers.

For Windows users, I suggest CopyPod, available for $20 with a two-week free trial, at www.copypod.net. For Mac users, I like PodWorks, available for $8 with a limited-function 30-day free trial at www.scifihifi.com/podworks. Another, similar program, which comes in versions for both Windows and Mac, is PodUtil, available for £10 ($17.66), with an unlimited free trial, at www.kennettnet.co.uk.

Once you have installed one of these utilities on your second computer, just plug in your iPod, filled with the music from the first computer. When iTunes pops up, be sure to decline when the program asks if you want to synchronize your iPod to the second computer. If you don’t decline, iTunes will wipe out your iPod’s contents and replace it with any music on the second computer.

Next, quit iTunes and launch the music-copying utility, if it didn’t launch automatically when you plugged in your iPod. It will scan your iPod, displaying all the music stored there, and allow you to copy some or all of the music onto the second computer. If you have a lot of music on the iPod, this could take awhile.

When you’re done, just quit the utility program, disconnect the iPod, and relaunch iTunes. In some cases, the utility will already have populated iTunes with the copied music. In other cases, you’ll have to use the “Add to Library” command in the iTunes File menu to bring in the music you have just copied.

How about the multiple-libraries problem? This one can be solved with some workarounds, as well as third-party software.

Suppose you want to synchronize only part of a library to a particular iPod, say mom’s iPod, in a family with several iPods. You can place the songs mom wants into a playlist called, for instance, “Mom’s iPod Songs.” Then, when mom’s iPod is connected, you can go into the Preferences settings in iTunes to designate that mom’s iPod will automatically be synchronized only with the songs in that playlist, rather than all the songs in the library.

Or, you can go into Preferences to designate that mom’s iPod won’t be automatically filled at all, but will be filled manually. Then, you could manually drag all the songs she likes onto the icon representing her iPod within iTunes.

A better approach is to download a utility program called Libra, which comes in versions for both Windows and Mac. Libra, which costs $10 with an unlimited free trial period, is available at homepage.mac.com/sroy/libra. It allows you to create multiple libraries, and to switch among them.

You just run Libra, create a library — for instance, Mom’s Library — and then select it. Next, you launch iTunes, and it comes up with only that library displayed. The first time you set up a new library, it will be empty. But you can just use the iTunes “Add to Library” command to fill it up with songs from your hard disk. You can then set up playlists that will be displayed only in that library. And you can synchronize the whole library to an iPod of your choice.

Multiple libraries can use the same songs without the need to store multiple copies of the songs.

Let’s hope Apple can build these features into the iPod and iTunes soon. Until then, the utility programs are your best bet.

• Email me at mossberg@wsj.com.

Here are a few questions about computers I’ve received recently from people like you, and my answers. I have edited and restated the questions a bit, for readability. This week my mailbox contained questions about signing up for Gmail, iPod-to-computer transfers and switching your computer’s power options.

If you have a question, send it to me at mossberg@wsj.com, and I may select it to be answered here in Mossberg’s Mailbox.

Your recent article mentioned that Google’s new Google Talk instant-messaging service was available only to users of Google’s Gmail email service. But Gmail isn’t open for new sign-ups. How can I get onto Gmail?

You are correct that people can’t just sign up for Gmail from their computers. There are two ways to get a Gmail account. You can receive an invitation from an existing member to sign up. Or, Google now allows anyone to join, provided you sign up using your cellphone and its SMS, or text-messaging, feature. Instructions for doing this are at: https://www.google.com/accounts/SmsMailSignup1

I have tested this cellphone method, and found that it works fine. Once you sign up via your cellphone, you can use Gmail with your PC or Macintosh. You don’t have to keep using your cellphone. Google says it requires the cellphone signup in order to thwart spammers who might want to use automated computer programs to obtain multiple Gmail accounts and use these accounts as a platform for sending millions of spam emails.

I have my entire music library on my iPod, placed there using Apple’s iTunes software on my main PC. Now, I want to move all the music to a second computer. But the iPod doesn’t have the capability to synchronize music to a second computer, even using the Apple iTunes software. When I try, iTunes warns that it will overwrite my iPod with its own library, which, on this second computer, is empty. Is there a way to do this?

Yes. Apple did cripple iPod-to-computer transfers, in order to please the record industry, which feared the iPod might be used to copy music to the computers of people who hadn’t purchased it, either from Apple’s iTunes store or in the form of CDs. But many utility programs have been created to allow iPod-to-computer transfers.

I have tested two such programs, and found they work well. One, for Windows, is CopyPod, which costs $19.90, at copypod.ouvaton.org. The other, for the Macintosh, is iPodRip, at $15, from www.thelittleappfactory.com.

To conserve power, my monitor shuts down automatically after five minutes or so of inactivity. This is OK most of the time, but if I want to leave a photo slide show running occasionally, I’d like to be able to override this feature. Can you tell me how? I’m running Windows XP.

The simplest way is to go into the computer’s control panel and change the setting that turns off the monitor. Click on the Start button, then click on Control Panel. Then, open the panel called Power Options. (Depending on how your computer is set up, you may have to first click on the category called “Performance and Maintenance.”)

Next, on the tab called Power Schemes, change the setting for “Turn off monitor” to “Never,” or to a time period long enough for your slide show to play. Then, click “OK.” To resume your typical five-minute turnoff, just go into this control panel again and change the setting back to “After 5 mins.” If you play slide shows often enough that doing this each time would be a pain, keep the setting at a period lengthy enough to accommodate the slide shows.

If the slide show is triggered as a screen saver, rather than as a manual process, you should be able to use the Display control panel to start it after five minutes, instead of turning off the monitor, and then set the monitor to shut off, using the Power Options panel, at a later time, after the slide show has had a chance to run for a while.

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Because of the volume of e-mail I receive, I can’t routinely answer individual questions by e-mail, or consult on individual problems or purchasing decisions. I read all questions I receive and select three each week to answer in the column.

Write to Walter S. Mossberg at mossberg@wsj.com